Is it safe to jump a battery that low: not really. Make that not at all safe
A healthy battery is about 12.8V
by the time it hits 11V, it is massively discharged already.
To get to 3.6v, you battery is so discharged that you have already damaged it. Or much more
likely, it has already been damaged, causing this voltage.
If you jumpstart it, several things could go wrong:
You could set your battery on fire!! (If the cause is a short in the battery)
You could explode your battery!! (if the cause is a very dry cell)
You could overtax the jump cables. Very likely, actually, with a battery this low and consumer-grade cables.
You could miraculously get your vehicle started. In which case your poor alternator is trying valiantly to not only power your car, but also to charge the battery which will appear very similar to a dead short to it! This can fry your alternator.
You could also fry the brains of either vehicle in the jumpstart, due to the wildly fluctuating voltages experienced during the attempted jumpstart.
TAKE OUT your dead battery. Replace with a known working, charged one.
Drive to the nearest battery specialist, have them test the dead battery, and your vehicle's charging system for you.
(or in your case, with a brand new car....)
Phone the dealer, hand them your location along with some choice 4-letter-words, and have them tow their vehicle back at their own expense. And provide you with a loaner until they sort out the problem.